Pythagoras said that this world was like a stage / Whereon many play their parts; the lookers-on, the sage. Shakespeare Agreed!

"I hold the world but as the world, Gratiano;A stage where every man must play a part,And mine a sad one."(The Merchant of Venice, Act I, Scene I)

"For what else is the life of man but a kind of play in which men in various costumes perform until the director motions them offstage?" Erasmus

All The World's A StageAll the world's a stage,And all the men and women merely players;They have their exits and their entrances,And one man in his time plays many parts,His acts being seven ages. At first, the infant,Mewling and puking in the nurse's arms.Then the whining schoolboy, with his satchelAnd shining morning face, creeping like snailUnwillingly to school. And then the lover,Sighing like furnace, with a woeful balladMade to his mistress' eyebrow. Then a soldier,Full of strange oaths and bearded like the pard,Jealous in honor, sudden and quick in quarrel,Seeking the bubble reputationEven in the cannon's mouth. And then the justice,In fair round belly with good capon lined,With eyes severe and beard of formal cut,Full of wise saws and modern instances;And so he plays his part. The sixth age shiftsInto the lean and slippered pantaloon,With spectacles on nose and pouch on side;His youthful hose, well saved, a world too wideFor his shrunk shank, and his big manly voice,Turning again toward childish treble, pipesAnd whistles in his sound. Last scene of all,That ends this strange eventful history,Is second childishness and mere oblivion,Sans teeth, sans eyes, sans taste, sans everything.

In As You Like It, Act 2 Scene 7, Shakespeare has Jaques talk through the ‘seven ages of man’. According to Shakespeare’s monologue the seven ages of man are:

The InfancyIn this stage the man is born as a helpless baby and knows little but waiting as a man in embryo to spring out.

The SchoolboyHere, he begins his schooling and is unwilling to go to school; the charms of helpless innocence cease.

The LoverThe lover is depicted as a young man composing his love poems, shown beneath two pictures of Cupid, the god of love and on the left, Romeo-Juliet balcony scene.

The SoldierHere, he is hot-blooded with a high degree of self-respect. He looks forward to gaining a reputation, even if it costs him his life. He is inflamed with the love of war and, like a leopard, he charges.

The JusticeHere, he attains a socially accepted state and expounds the wisdom he has gained in his life.

The PantaloonHere, he tries to shrink himself into a shell of his worries and is indifferent to his physical appearance and apparel, just as he was in his youth.

The Old AgeNow he is bound to be dependent on others and there comes an end to 'the strange eventful history' which is nothing but a repetition of the first stage, infancy, lacking all the senses and everything.